Camera device and shake correction method

Abstract

A camera device includes a lens unit that includes a zoom lens on which subject light is incident, and can change a zoom magnification of the zoom lens, an imaging element that images an image based on the subject light, a shake sensor that detects shake of the camera device, a shake correction mechanism that holds a holder holding the imaging element, and performs shake correction on a captured image captured by the imaging element through driving of the holder based on a detection value of the shake sensor, and a processor that causes the lens unit to change the zoom magnification of the zoom lens based on the detection value of the shake sensor, cuts a part of the captured image on which the shake correction is performed by the shake correction mechanism through a zoom process according to the changed zoom magnification, and outputs the cut part.

What is claimed is: 
     
       1. A camera device which is fixed to a fixing target surface and is provided in a place in which shaking occurs on the fixing target surface, the device comprising:
 a lens unit that includes a zoom lens on which subject light is incident, and is capable of changing a zoom magnification of the zoom lens; 
 an imaging element that images an image based on the subject light; 
 a shake sensor that detects shake of the camera device; 
 a shake correction mechanism that holds a holder which holds the imaging element, and performs shake correction on a captured image captured by the imaging element through driving of the holder based on a detection value of the shake sensor; 
 a processor that causes the lens unit to change the zoom magnification of the zoom lens based on the detection value of the shake sensor, cuts a part of the captured image on which the shake correction is performed by the shake correction mechanism through a zoom process according to the changed zoom magnification, and outputs the cut part of the captured image; and 
 a memory that stores movable amount information acquired by associating the zoom magnification of the zoom lens with a movable amount of the imaging element based on the driving of the holder, 
 wherein, when a movement amount of the imaging element based on the detection value of the shake sensor exceeds the movable amount of the imaging element corresponding to the zoom magnification of the zoom lens, the processor causes the lens unit to change the zoom magnification of the zoom lens, cuts the part of the captured image on which the shake correction is performed by the shake correction mechanism through the zoom process, and outputs the cut part of the captured image. 
 
     
     
       2. The camera device of  claim 1 ,
 wherein the processor cuts the part of the captured image on which the shake correction is performed by the shake correction mechanism through the zoom process using a ratio between the zoom magnification of the zoom lens before the zoom magnification is changed and the zoom magnification of the zoom lens after the zoom magnification is changed. 
 
     
     
       3. The camera device of  claim 1 ,
 wherein the memory further stores change rate information acquired by associating the detection value of the shake sensor with a change rate of the zoom magnification of the zoom lens for each detection time for a predetermined period of time, and 
 wherein the processor causes the lens unit to change the zoom magnification of the zoom lens by using a maximum value of the change rates of the zoom magnification of the zoom lens which are included in the change rate information. 
 
     
     
       4. The camera device of  claim 1 ,
 wherein the memory further stores change rate information acquired by associating the detection value of the shake sensor with a change rate of the zoom magnification of the zoom lens for each detection time for a predetermined period of time, and 
 wherein the processor causes the lens unit to change the zoom magnification of the zoom lens by using an average value of the change rates of the zoom magnification of the zoom lens which are included in the change rate information. 
 
     
     
       5. The camera device of  claim 1 ,
 wherein the memory further stores change rate information acquired by associating the detection value of the shake sensor with a change rate of the zoom magnification of the zoom lens for each detection time for a predetermined period of time, and 
 wherein the processor causes the lens unit to change the zoom magnification of the zoom lens by using a temporal change of the change rates of the zoom magnification of the zoom lens which are included in the change rate information. 
 
     
     
       6. The camera device of  claim 1 ,
 wherein the shake sensor is attached to a housing of the lens unit. 
 
     
     
       7. A camera device which is fixed to a fixing target surface and is provided in a place in which shaking occurs on the fixing target surface, the device comprising:
 a lens unit that includes a zoom lens on which subject light is incident, and is capable of changing a zoom magnification of the zoom lens; 
 an imaging element that images an image based on the subject light; 
 a shake sensor that detects shake of the camera device; 
 a shake correction mechanism that holds a holder which holds the imaging element, and performs shake correction on a captured image captured by the imaging element through driving of the holder based on a detection value of the shake sensor; 
 a processor that causes the lens unit to change the zoom magnification of the zoom lens based on the detection value of the shake sensor, cuts a part of the captured image on which the shake correction is performed by the shake correction mechanism through a zoom process according to the changed zoom magnification, and outputs the cut part of the captured image; and 
 a memory that stores movable amount information acquired by associating the zoom magnification of the zoom lens with a movable amount of the imaging element based on the driving of the holder, 
 wherein, when a movement amount of the imaging element based on the detection value of the shake sensor exceeds the movable amount of the imaging element corresponding to the zoom magnification of the zoom lens, the processor causes the lens unit to change the zoom magnification of the zoom lens, cuts the part of the captured image on which the shake correction is performed by the shake correction mechanism through the zoom process, and outputs the cut part of the captured image, and 
 wherein the processor outputs a first control signal for decreasing the zoom magnification of the zoom lens to the lens unit, and cuts the part of the captured image on which the shake correction is performed by the shake correction mechanism through a zoom-in process. 
 
     
     
       8. A shake correction method using a camera device which is fixed to a fixing target surface and is provided in a place in which shaking occurs on the fixing target surface, the method comprising:
 detecting, by a sensor, shake of the camera device; 
 imaging an image based on subject light by an imaging element; 
 performing shake correction on a captured image captured by the imaging element through driving of a holder which holds the imaging element based on a detection value of the detected shake of the camera device; 
 changing, by a processor, a zoom magnification of a zoom lens on which the subject light is incident based on the detection value of the detected shake of the camera device; 
 cutting, by the processor, a part of the captured image on which the shake correction is performed through a zoom process according to the changed zoom magnification; 
 outputting, by the processor, the cut part of the captured image; and 
 storing, in a memory, movable amount information acquired by associating the zoom magnification of the zoom lens with a movable amount of the imaging element based on the driving of the holder, 
 wherein, when a movement amount of the imaging element based on the detection value of the detected shake of the camera device exceeds the movable amount of the imaging element corresponding to the zoom magnification of the zoom lens, causing the processor to change the zoom magnification of the zoom lens, cut the part of the captured image on which the shake correction is performed through the zoom process, and output the cut part of the captured image.